Simulation of the atmospheric concentrations of 210Pb and 7Be and comparison with daily observations at three surface sites |
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| Institution: | 1. Department of Applied Physics, University of Huelva, Spain;2. Radioactivity Environmental Monitoring, European Commission Joint Research Centre, ITU – Institute for Transuranium Elements, Ispra, Italy;3. Department of Applied Physics, University of Cádiz, Spain;4. Department of Applied Physics II, University of Seville, Spain;1. U.S. Geological Survey, 400 Natural Bridges Drive, Santa Cruz, CA 95060, USA;2. Institute of Marine Sciences, University of California, 1156 High Street, Santa Cruz, CA 95064, USA;1. IMAR-CMA Marine and Environmental Research Centre, Department of Life Sciences, University of Coimbra, 3004-517 Coimbra, Portugal;2. Dipartimento di Biologia, Università di Firenze, Via Romana, 17, 50125 Florence, Italy;1. Servicio Técnico de la Reserva de la Biosfera de Urdaibai, Dirección de Medio Natural y Planificación Ambiental del Gobierno Vasco, Allende Salazar Etorbidea, 4, P.K. 130, 48300, Gernika-Lumo, Spain;2. National Oceanography Centre, School of Ocean and Earth Science, University of Southampton, European Way, Southampton, SO14 3ZH, UK;3. Departamento de Estratigrafía y Paleontología, Facultad de Ciencia y Tecnología, Universidad del País Vasco UPV/EHU, Apartado 644, 48080, Bilbao, Spain |
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| Abstract: | The atmospheric transport of 210Pb and 7Be is simulated by the Laboratoire de Météorologie Dynamique general circulation model, LMDz, driven by ECMWF reanalyses. Daily averaged concentrations collected at three surface stations are compared with numerical results for a 1 year (2004) global simulation. The model, with a resolution of 3.75°×2.5° and 19 levels, succeeds in reproducing daily variations of 210Pb and 7Be concentrations. Figures of merit in time (FMT), quantifying the overlapping of the predicted and observed time series over each month, range from 55% to 70%. Sensitivity studies as well as the analysis of numerical signals allow determining the main physical atmospheric processes characterizing the stations on a daily basis. Concentrations of 210Pb at the three stations are particularly sensitive to scavenging in convective updrafts. |
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